Lieberman J, Sastre A
Ann Intern Med. 1980 Dec;93(6):825-6. doi: 10.7326/0003-4819-93-6-825.
Elevated levels of serum angiotensin-converting enzyme were detected in 24% of 265 patients with diabetes mellitus. The elevations correlated strongly with the presence of severe retinopathy. Diabetes mellitus must be considered when an assay of serum angiotensin-converting enzyme is used to confirm a diagnosis of sarcoidosis.